如何在用户输入中识别姓名(从文本文件中)，然后打印姓名

import re

def extract_names_from_text(text):
    # 使用正则表达式提取姓名
    pattern = r'\b[A-Z][a-z]+\b'  # 姓名通常以大写字母开头，后跟小写字母
    names = re.findall(pattern, text)
    return names

def print_names_from_file(file_path):
    try:
        with open(file_path, 'r') as file:
            text = file.read()
            names = extract_names_from_text(text)
            if names:
                for name in names:
                    print(name)
            else:
                print("未找到姓名")
    except FileNotFoundError:
        print("文件不存在")

# 示例调用
file_path = "input.txt"  # 替换为实际的文件路径
print_names_from_file(file_path)